mirror of https://github.com/docker/cli.git
54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
|
/*
|
||
|
|
Copyright The containerd Authors.
|
||
|
|
|
||
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
you may not use this file except in compliance with the License.
|
||
|
|
You may obtain a copy of the License at
|
||
|
|
|
||
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
|
||
|
|
Unless required by applicable law or agreed to in writing, software
|
||
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
See the License for the specific language governing permissions and
|
||
|
|
limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
package console
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"os"
|
||
|
|
"unsafe"
|
||
|
|
|
||
|
|
"golang.org/x/sys/unix"
|
||
|
|
)
|
||
|
|
|
||
|
|
const (
|
||
|
|
cmdTcGet = unix.TIOCGETA
|
||
|
|
cmdTcSet = unix.TIOCSETA
|
||
|
|
)
|
||
|
|
|
||
|
|
func ioctl(fd, flag, data uintptr) error {
|
||
|
|
if _, _, err := unix.Syscall(unix.SYS_IOCTL, fd, flag, data); err != 0 {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// unlockpt unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by f.
|
||
|
|
// unlockpt should be called before opening the slave side of a pty.
|
||
|
|
func unlockpt(f *os.File) error {
|
||
|
|
var u int32
|
||
|
|
return ioctl(f.Fd(), unix.TIOCPTYUNLK, uintptr(unsafe.Pointer(&u)))
|
||
|
|
}
|
||
|
|
|
||
|
|
// ptsname retrieves the name of the first available pts for the given master.
|
||
|
|
func ptsname(f *os.File) (string, error) {
|
||
|
|
n, err := unix.IoctlGetInt(int(f.Fd()), unix.TIOCPTYGNAME)
|
||
|
|
if err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
return fmt.Sprintf("/dev/pts/%d", n), nil
|
||
|
|
}
|